Can somebody explain the difference in camera lenses and what all those numbers mean?

I am in the market for a lens for me newly purchased DSLR--specifically a Nikon D40X. I don't know that much about lenses or which kinds you need to take certain types of pictures. So I would really like to know just exactly what all those numbers mean. 55-200mm ??? Thanks for all your... show more I am in the market for a lens for me newly purchased DSLR--specifically a Nikon D40X. I don't know that much about lenses or which kinds you need to take certain types of pictures. So I would really like to know just exactly what all those numbers mean. 55-200mm ??? Thanks for all your help!!


http://www.circuitcity.com/ssm/Nikon-Zoo...
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